﻿using System;

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace A78万类之祖Object类
{
    class Program
    {
        static void Main(string[] args)
        {
            A a = new A();
           

            int x= 123; 
            Object o2 = x;//装箱
            int x1 = (int)o2;//拆箱  尽量避免拆装箱
        }
    }

    class A 
    {

    }
}
